diff --git a/README.md b/README.md
index c7f6bf2..41aedc5 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,7 @@ highlighter = new Highlights()
 html = highlighter.highlightSync
   fileContents: 'var hello = "world";'
   scopeName: 'source.js'
+  scopePrefix: 'syntax--'
 
 console.log html
 ```